Open Access
Investigation of Afterburner Combustion Screech and Methods of Its Control at High Combustor Pressure Levels
TLDR
In this paper, the authors present an experimental investigation of various methods for the control of afterburner combustion screech at after-burner-inlet total pressures from 4000 to 6400 pounds per square foot absolute.Abstract:
Memorandum presenting an experimental investigation of various methods for the control of afterburner combustion screech at afterburner-inlet total pressures from 4000 to 6400 pounds per square foot absolute. Generally, the range of afterburner fuel-air ratios in which screech occurred and the intensity of screech did not vary appreciably in the range of pressures covered.read more
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Journal ArticleDOI
Advances and challenges in modeling high-speed turbulent combustion in propulsion systems
TL;DR: In this paper, the authors address the problems encountered when modeling high-speed combustion, or in other words, what are the problems of turbulent-combustion modeling? Do such interactions need modeling? What are the challenges when going from modeling low-speed-to-high-speed combustions problems?
Journal ArticleDOI
On the emergence of critical regions at the onset of thermoacoustic instability in a turbulent combustor.
Vishnu R. Unni,Abin Krishnan,R. Manikandan,Nitin B. George,R. I. Sujith,Norbert Marwan,Jürgen Kurths +6 more
TL;DR: This work uses complex network theory to investigate the dynamical transition from stable operation to thermoacoustic instability via intermittency in a turbulent combustor with a bluff body stabilized flame, and finds that during combustion noise, the bluff body wake turns out to be the critical region that determines the dynamics of the combustor.
DissertationDOI
A method for the numerical analysis of combustion instabilities with an application to afterburner screech
TL;DR: In this paper, a framework is presented to predict the frequency and stability of high frequency screech instability of afterburners using a hybrid numerical method that includes separate calculations of the mean flow and of the perturbed field due to the acoustic oscillations.
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